1. Write something completely redundant in a language that isn't remotely suited for it, just because you "can".2. Bitch endlessly about how unsuited the language was for doing such a common, redundant task.3. Profit.

I assume he's referring to the castle in the film. In the book, the moving castle was an actual castle, with towers and crenellations and stuff, and floated serenely about a metre above the ground. It was also almost entirely illusory.